PNEUROP

The stringent requirements covering oxidation stability are defined by the test method DIN 51352, Part 2, known as the Pneurop Oxidation Test (POT). This test simulates the oxidizing effects of high temperature, intimate exposure to air, and the presence of iron oxide, which acts as catalyst - all factors highly conducive to the chemical breakdown of oil, and the consequent formation of deposits that can lead to fire and explosion. 

Rotary-screw compressor mineral oils oxidation resistance is assessed in a modified Pneurop oxidation test using iron naphthenate catalyst at 120°C (250°F)... 

An important special case in the general considerations made above relating to the topic of vapor tolerance is that of pumping water vapor. According to PNEUROP water vapor tolerance is defined as follows ... 

Maximum compression is attained at zero throughput (see PNEUROP and DIN 28 426, Part 2). It is designated as kg ... 

The pumping speed of sputter-ion pumps depends on the pressure and the type of gas. It is measured according to the methods stated in DIN 28 429 and PNEUROP 5615. The pumping speed curve S(p) has a maximum. The nominal pumping speed is given by the maximum of the pumping speed curve for air whereby the corresponding pressure must be stated. 

Bolted flanges (ISO-F) for the same nominal widths as above (according to PNEUROP and ISO/TC 112). In special cases bolted flanges having a smaller nominal width are used. Clamp flanges and bolted flanges are In accordance with DIN 28 404. 

Nominal internal diameters (DN) and internal diameters of tubes, pipes and apertures with circular cross-section (according to PNEUROP). 

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